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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999
5 * Author(s): Hartmut Penner (hp@de.ibm.com)
6 *
7 * Derived from "arch/i386/mm/init.c"
8 * Copyright (C) 1995 Linus Torvalds
9 */
10
11#include <linux/signal.h>
12#include <linux/sched.h>
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/string.h>
16#include <linux/types.h>
17#include <linux/ptrace.h>
18#include <linux/mman.h>
19#include <linux/mm.h>
20#include <linux/swap.h>
21#include <linux/swiotlb.h>
22#include <linux/smp.h>
23#include <linux/init.h>
24#include <linux/pagemap.h>
25#include <linux/memblock.h>
26#include <linux/memory.h>
27#include <linux/pfn.h>
28#include <linux/poison.h>
29#include <linux/initrd.h>
30#include <linux/export.h>
31#include <linux/cma.h>
32#include <linux/gfp.h>
33#include <linux/dma-direct.h>
34#include <linux/percpu.h>
35#include <asm/processor.h>
36#include <linux/uaccess.h>
37#include <asm/pgalloc.h>
38#include <asm/kfence.h>
39#include <asm/ptdump.h>
40#include <asm/dma.h>
41#include <asm/abs_lowcore.h>
42#include <asm/tlb.h>
43#include <asm/tlbflush.h>
44#include <asm/sections.h>
45#include <asm/ctl_reg.h>
46#include <asm/sclp.h>
47#include <asm/set_memory.h>
48#include <asm/kasan.h>
49#include <asm/dma-mapping.h>
50#include <asm/uv.h>
51#include <linux/virtio_anchor.h>
52#include <linux/virtio_config.h>
53
54pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir");
55static pgd_t invalid_pg_dir[PTRS_PER_PGD] __section(".bss..invalid_pg_dir");
56
57unsigned long s390_invalid_asce;
58
59unsigned long empty_zero_page, zero_page_mask;
60EXPORT_SYMBOL(empty_zero_page);
61EXPORT_SYMBOL(zero_page_mask);
62
63static void __init setup_zero_pages(void)
64{
65 unsigned int order;
66 struct page *page;
67 int i;
68
69 /* Latest machines require a mapping granularity of 512KB */
70 order = 7;
71
72 /* Limit number of empty zero pages for small memory sizes */
73 while (order > 2 && (totalram_pages() >> 10) < (1UL << order))
74 order--;
75
76 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
77 if (!empty_zero_page)
78 panic("Out of memory in setup_zero_pages");
79
80 page = virt_to_page((void *) empty_zero_page);
81 split_page(page, order);
82 for (i = 1 << order; i > 0; i--) {
83 mark_page_reserved(page);
84 page++;
85 }
86
87 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
88}
89
90/*
91 * paging_init() sets up the page tables
92 */
93void __init paging_init(void)
94{
95 unsigned long max_zone_pfns[MAX_NR_ZONES];
96 unsigned long pgd_type, asce_bits;
97 psw_t psw;
98
99 s390_invalid_asce = (unsigned long)invalid_pg_dir;
100 s390_invalid_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
101 crst_table_init((unsigned long *)invalid_pg_dir, _REGION3_ENTRY_EMPTY);
102 init_mm.pgd = swapper_pg_dir;
103 if (VMALLOC_END > _REGION2_SIZE) {
104 asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
105 pgd_type = _REGION2_ENTRY_EMPTY;
106 } else {
107 asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
108 pgd_type = _REGION3_ENTRY_EMPTY;
109 }
110 init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
111 S390_lowcore.kernel_asce = init_mm.context.asce;
112 S390_lowcore.user_asce = s390_invalid_asce;
113 crst_table_init((unsigned long *) init_mm.pgd, pgd_type);
114 vmem_map_init();
115 kasan_copy_shadow_mapping();
116
117 /* enable virtual mapping in kernel mode */
118 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
119 __ctl_load(S390_lowcore.user_asce, 7, 7);
120 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
121 psw.mask = __extract_psw();
122 psw_bits(psw).dat = 1;
123 psw_bits(psw).as = PSW_BITS_AS_HOME;
124 __load_psw_mask(psw.mask);
125 kasan_free_early_identity();
126
127 sparse_init();
128 zone_dma_bits = 31;
129 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
130 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
131 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
132 free_area_init(max_zone_pfns);
133}
134
135void mark_rodata_ro(void)
136{
137 unsigned long size = __end_ro_after_init - __start_ro_after_init;
138
139 set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT);
140 pr_info("Write protected read-only-after-init data: %luk\n", size >> 10);
141 debug_checkwx();
142}
143
144int set_memory_encrypted(unsigned long vaddr, int numpages)
145{
146 int i;
147
148 /* make specified pages unshared, (swiotlb, dma_free) */
149 for (i = 0; i < numpages; ++i) {
150 uv_remove_shared(virt_to_phys((void *)vaddr));
151 vaddr += PAGE_SIZE;
152 }
153 return 0;
154}
155
156int set_memory_decrypted(unsigned long vaddr, int numpages)
157{
158 int i;
159 /* make specified pages shared (swiotlb, dma_alloca) */
160 for (i = 0; i < numpages; ++i) {
161 uv_set_shared(virt_to_phys((void *)vaddr));
162 vaddr += PAGE_SIZE;
163 }
164 return 0;
165}
166
167/* are we a protected virtualization guest? */
168bool force_dma_unencrypted(struct device *dev)
169{
170 return is_prot_virt_guest();
171}
172
173/* protected virtualization */
174static void pv_init(void)
175{
176 if (!is_prot_virt_guest())
177 return;
178
179 virtio_set_mem_acc_cb(virtio_require_restricted_mem_acc);
180
181 /* make sure bounce buffers are shared */
182 swiotlb_init(true, SWIOTLB_FORCE | SWIOTLB_VERBOSE);
183 swiotlb_update_mem_attributes();
184}
185
186void __init mem_init(void)
187{
188 cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
189 cpumask_set_cpu(0, mm_cpumask(&init_mm));
190
191 set_max_mapnr(max_low_pfn);
192 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
193
194 pv_init();
195 kfence_split_mapping();
196 /* Setup guest page hinting */
197 cmma_init();
198
199 /* this will put all low memory onto the freelists */
200 memblock_free_all();
201 setup_zero_pages(); /* Setup zeroed pages. */
202
203 cmma_init_nodat();
204}
205
206void free_initmem(void)
207{
208 __set_memory((unsigned long)_sinittext,
209 (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
210 SET_MEMORY_RW | SET_MEMORY_NX);
211 free_initmem_default(POISON_FREE_INITMEM);
212}
213
214unsigned long memory_block_size_bytes(void)
215{
216 /*
217 * Make sure the memory block size is always greater
218 * or equal than the memory increment size.
219 */
220 return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
221}
222
223unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
224EXPORT_SYMBOL(__per_cpu_offset);
225
226static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
227{
228 return LOCAL_DISTANCE;
229}
230
231static int __init pcpu_cpu_to_node(int cpu)
232{
233 return 0;
234}
235
236void __init setup_per_cpu_areas(void)
237{
238 unsigned long delta;
239 unsigned int cpu;
240 int rc;
241
242 /*
243 * Always reserve area for module percpu variables. That's
244 * what the legacy allocator did.
245 */
246 rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
247 PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
248 pcpu_cpu_distance,
249 pcpu_cpu_to_node);
250 if (rc < 0)
251 panic("Failed to initialize percpu areas.");
252
253 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
254 for_each_possible_cpu(cpu)
255 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
256}
257
258#ifdef CONFIG_MEMORY_HOTPLUG
259
260#ifdef CONFIG_CMA
261
262/* Prevent memory blocks which contain cma regions from going offline */
263
264struct s390_cma_mem_data {
265 unsigned long start;
266 unsigned long end;
267};
268
269static int s390_cma_check_range(struct cma *cma, void *data)
270{
271 struct s390_cma_mem_data *mem_data;
272 unsigned long start, end;
273
274 mem_data = data;
275 start = cma_get_base(cma);
276 end = start + cma_get_size(cma);
277 if (end < mem_data->start)
278 return 0;
279 if (start >= mem_data->end)
280 return 0;
281 return -EBUSY;
282}
283
284static int s390_cma_mem_notifier(struct notifier_block *nb,
285 unsigned long action, void *data)
286{
287 struct s390_cma_mem_data mem_data;
288 struct memory_notify *arg;
289 int rc = 0;
290
291 arg = data;
292 mem_data.start = arg->start_pfn << PAGE_SHIFT;
293 mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT);
294 if (action == MEM_GOING_OFFLINE)
295 rc = cma_for_each_area(s390_cma_check_range, &mem_data);
296 return notifier_from_errno(rc);
297}
298
299static struct notifier_block s390_cma_mem_nb = {
300 .notifier_call = s390_cma_mem_notifier,
301};
302
303static int __init s390_cma_mem_init(void)
304{
305 return register_memory_notifier(&s390_cma_mem_nb);
306}
307device_initcall(s390_cma_mem_init);
308
309#endif /* CONFIG_CMA */
310
311int arch_add_memory(int nid, u64 start, u64 size,
312 struct mhp_params *params)
313{
314 unsigned long start_pfn = PFN_DOWN(start);
315 unsigned long size_pages = PFN_DOWN(size);
316 int rc;
317
318 if (WARN_ON_ONCE(params->altmap))
319 return -EINVAL;
320
321 if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
322 return -EINVAL;
323
324 VM_BUG_ON(!mhp_range_allowed(start, size, true));
325 rc = vmem_add_mapping(start, size);
326 if (rc)
327 return rc;
328
329 rc = __add_pages(nid, start_pfn, size_pages, params);
330 if (rc)
331 vmem_remove_mapping(start, size);
332 return rc;
333}
334
335void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
336{
337 unsigned long start_pfn = start >> PAGE_SHIFT;
338 unsigned long nr_pages = size >> PAGE_SHIFT;
339
340 __remove_pages(start_pfn, nr_pages, altmap);
341 vmem_remove_mapping(start, size);
342}
343#endif /* CONFIG_MEMORY_HOTPLUG */
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999
5 * Author(s): Hartmut Penner (hp@de.ibm.com)
6 *
7 * Derived from "arch/i386/mm/init.c"
8 * Copyright (C) 1995 Linus Torvalds
9 */
10
11#include <linux/signal.h>
12#include <linux/sched.h>
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/string.h>
16#include <linux/types.h>
17#include <linux/ptrace.h>
18#include <linux/mman.h>
19#include <linux/mm.h>
20#include <linux/swap.h>
21#include <linux/smp.h>
22#include <linux/init.h>
23#include <linux/pagemap.h>
24#include <linux/bootmem.h>
25#include <linux/memory.h>
26#include <linux/pfn.h>
27#include <linux/poison.h>
28#include <linux/initrd.h>
29#include <linux/export.h>
30#include <linux/cma.h>
31#include <linux/gfp.h>
32#include <linux/memblock.h>
33#include <asm/processor.h>
34#include <linux/uaccess.h>
35#include <asm/pgtable.h>
36#include <asm/pgalloc.h>
37#include <asm/dma.h>
38#include <asm/lowcore.h>
39#include <asm/tlb.h>
40#include <asm/tlbflush.h>
41#include <asm/sections.h>
42#include <asm/ctl_reg.h>
43#include <asm/sclp.h>
44#include <asm/set_memory.h>
45
46pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
47
48unsigned long empty_zero_page, zero_page_mask;
49EXPORT_SYMBOL(empty_zero_page);
50EXPORT_SYMBOL(zero_page_mask);
51
52static void __init setup_zero_pages(void)
53{
54 unsigned int order;
55 struct page *page;
56 int i;
57
58 /* Latest machines require a mapping granularity of 512KB */
59 order = 7;
60
61 /* Limit number of empty zero pages for small memory sizes */
62 while (order > 2 && (totalram_pages >> 10) < (1UL << order))
63 order--;
64
65 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
66 if (!empty_zero_page)
67 panic("Out of memory in setup_zero_pages");
68
69 page = virt_to_page((void *) empty_zero_page);
70 split_page(page, order);
71 for (i = 1 << order; i > 0; i--) {
72 mark_page_reserved(page);
73 page++;
74 }
75
76 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
77}
78
79/*
80 * paging_init() sets up the page tables
81 */
82void __init paging_init(void)
83{
84 unsigned long max_zone_pfns[MAX_NR_ZONES];
85 unsigned long pgd_type, asce_bits;
86 psw_t psw;
87
88 init_mm.pgd = swapper_pg_dir;
89 if (VMALLOC_END > _REGION2_SIZE) {
90 asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
91 pgd_type = _REGION2_ENTRY_EMPTY;
92 } else {
93 asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
94 pgd_type = _REGION3_ENTRY_EMPTY;
95 }
96 init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
97 S390_lowcore.kernel_asce = init_mm.context.asce;
98 S390_lowcore.user_asce = S390_lowcore.kernel_asce;
99 crst_table_init((unsigned long *) init_mm.pgd, pgd_type);
100 vmem_map_init();
101
102 /* enable virtual mapping in kernel mode */
103 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
104 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
105 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
106 psw.mask = __extract_psw();
107 psw_bits(psw).dat = 1;
108 psw_bits(psw).as = PSW_BITS_AS_HOME;
109 __load_psw_mask(psw.mask);
110
111 sparse_memory_present_with_active_regions(MAX_NUMNODES);
112 sparse_init();
113 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
114 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
115 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
116 free_area_init_nodes(max_zone_pfns);
117}
118
119void mark_rodata_ro(void)
120{
121 unsigned long size = __end_ro_after_init - __start_ro_after_init;
122
123 set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT);
124 pr_info("Write protected read-only-after-init data: %luk\n", size >> 10);
125}
126
127void __init mem_init(void)
128{
129 cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
130 cpumask_set_cpu(0, mm_cpumask(&init_mm));
131
132 set_max_mapnr(max_low_pfn);
133 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
134
135 /* Setup guest page hinting */
136 cmma_init();
137
138 /* this will put all low memory onto the freelists */
139 free_all_bootmem();
140 setup_zero_pages(); /* Setup zeroed pages. */
141
142 cmma_init_nodat();
143
144 mem_init_print_info(NULL);
145}
146
147void free_initmem(void)
148{
149 __set_memory((unsigned long)_sinittext,
150 (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
151 SET_MEMORY_RW | SET_MEMORY_NX);
152 free_initmem_default(POISON_FREE_INITMEM);
153}
154
155#ifdef CONFIG_BLK_DEV_INITRD
156void __init free_initrd_mem(unsigned long start, unsigned long end)
157{
158 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
159 "initrd");
160}
161#endif
162
163unsigned long memory_block_size_bytes(void)
164{
165 /*
166 * Make sure the memory block size is always greater
167 * or equal than the memory increment size.
168 */
169 return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
170}
171
172#ifdef CONFIG_MEMORY_HOTPLUG
173
174#ifdef CONFIG_CMA
175
176/* Prevent memory blocks which contain cma regions from going offline */
177
178struct s390_cma_mem_data {
179 unsigned long start;
180 unsigned long end;
181};
182
183static int s390_cma_check_range(struct cma *cma, void *data)
184{
185 struct s390_cma_mem_data *mem_data;
186 unsigned long start, end;
187
188 mem_data = data;
189 start = cma_get_base(cma);
190 end = start + cma_get_size(cma);
191 if (end < mem_data->start)
192 return 0;
193 if (start >= mem_data->end)
194 return 0;
195 return -EBUSY;
196}
197
198static int s390_cma_mem_notifier(struct notifier_block *nb,
199 unsigned long action, void *data)
200{
201 struct s390_cma_mem_data mem_data;
202 struct memory_notify *arg;
203 int rc = 0;
204
205 arg = data;
206 mem_data.start = arg->start_pfn << PAGE_SHIFT;
207 mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT);
208 if (action == MEM_GOING_OFFLINE)
209 rc = cma_for_each_area(s390_cma_check_range, &mem_data);
210 return notifier_from_errno(rc);
211}
212
213static struct notifier_block s390_cma_mem_nb = {
214 .notifier_call = s390_cma_mem_notifier,
215};
216
217static int __init s390_cma_mem_init(void)
218{
219 return register_memory_notifier(&s390_cma_mem_nb);
220}
221device_initcall(s390_cma_mem_init);
222
223#endif /* CONFIG_CMA */
224
225int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
226 bool want_memblock)
227{
228 unsigned long start_pfn = PFN_DOWN(start);
229 unsigned long size_pages = PFN_DOWN(size);
230 int rc;
231
232 rc = vmem_add_mapping(start, size);
233 if (rc)
234 return rc;
235
236 rc = __add_pages(nid, start_pfn, size_pages, altmap, want_memblock);
237 if (rc)
238 vmem_remove_mapping(start, size);
239 return rc;
240}
241
242#ifdef CONFIG_MEMORY_HOTREMOVE
243int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
244{
245 /*
246 * There is no hardware or firmware interface which could trigger a
247 * hot memory remove on s390. So there is nothing that needs to be
248 * implemented.
249 */
250 return -EBUSY;
251}
252#endif
253#endif /* CONFIG_MEMORY_HOTPLUG */